Keyboard



FIG. 1 is a perspective view of a keyboard showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a front view thereof.

The broken line showing of various regions in FIGS. 1, 3, and 4 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a keyboard, as shown and described. 